Otakon is coming up, and I wanted to go as Excalibur from Soul Eater, but I need some help. I've never made a cosplay that difficult before. I mainly need help with making the head and hat. Does anyone have any suggestions on what material(s) to use for them?

Otakon is coming up, and I wanted to go as Excalibur from Soul Eater, but I need some help. I've never made a cosplay that difficult before. I mainly need help with making the head and hat. Does anyone have any suggestions on what material(s) to use for them?